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STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (PARENTHETICAL) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Sale of common stock, offering costs	$ 739

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- Definition

Payments of offering costs.

+ References

No definition available.

+ Details

Name:	prld_PaymentsOfOfferingCosts
Namespace Prefix:	prld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration